Abstract
The pattern evolution of striped and vortex domain structures in circular ferroelectric nano-islands with in-plane polarization and charged defects is investigated using the Monte Carlo simulation based on the Landau-Devonshire phenomenological theory. The domain structures of islands undergoing different annealing processes are compared. Given embedded charge carriers at the center of islands, the domain patterns would be markedly affected as a result of the competition and balance between the electrostatic charge energy and other free energy terms in the Landau-Devonshire phenomenological theory. The symmetry of islands with different sizes and charge quantities is also analyzed. The present work provides a simple explanation of a variety of ferroelectric nano-islands and proposes an alternative promising approach to tune the domain structures and symmetry for the applications of nano-sized ferroelectric devices.
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